Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4859877 | Bidirectional digital signal transmission system | Richard W. Sieber | 1989-08-22 |
| 4818988 | Crosspoint switching array | Richard W. Sieber | 1989-04-04 |
| 4805196 | Line delay compensation for digital transmission systems utilizing low power line drivers | Richard W. Sieber | 1989-02-14 |